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CSD86360 and the TI NExFET Power Loss Calculation Tool

Chris Mulvey
Prodigy 180 points
Other Parts Discussed in Thread: CSD

I downloaded the Excel Spreadsheet mentioned above, and in trying to enter the data I was not sure about a few entries.  Rds on is not explicitaly stated in the CSD data sheet but Zds is, should Zds be used?  Qg  Plateau is asked for, I am not sure where to find this.  Rdson 100C tempco is asked for and I am not sure where to find this. Qrr is asked for, I could not find this but there is Crss listed on the data sheet.  Thanks for any help in using this spreadsheet

  • 0
    TI__Mastermind 18200 points
    Chris,
    The Rdson is provided later in the datasheet, on page 10, or Figures 20 and 21 for different gate voltages. Qg plateau is not given but this is the gate charge at which the plateau occurs in the Vgs vs Qg curve so it can be estimated from figures 14 and 15. Similarly, the Rdson 100C tempco can be seen in Figures 22 and 23. Qrr is provided in the diode characteristics portion of the electrical specs table on page 3.

    While its great you are using this excel based tool we've provided, I would also like to point you towards another FET power loss tool we only recently released, where all these parameters are automated. This loss calculator is very accurate, taking second order losses (like common source inductance) into effect, and should be much easier to use.

    I'd be really interested in hearing your feedback on this tool because we only released it a few weeks ago and it is literally a year in the making.

    www.ti.com/.../fetpwrcalc (click Design Now).
  • 0 in reply to Brett Barr1
    Prodigy 180 points

    How can we obtain an unencrypted Spice model of the CSD86360 Dual FET Power Block?  Does a specific NDA need to be signed? Or does a general NDA between Curtiss Wright and TI cover this?

  • 0 in reply to Chris Mulvey
    TI__Mastermind 18200 points

    Chris, 

    Please reach out through your sales contact - they should be able to obtain this for you. I believe a general NDA between Curtis Wright and TI should cover this.